When will the HCS pack go away?

Does anyone know when it will no longer be available? I want to know how much time I have to get the REQ points required.

Beginning yesterday the Packs will be available for 72 hours.

72 hours from release. So I assume sometime Monday.

When you go to the Halo site, it tells you on the banner. 12:00 PM PT on Sunday, 12/6/15.